package com.hmdp.utils;


import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;
    //这里没把拦截器放到ioc容器所以使用构造方法注入,当然如果拦截器放到ioc里就可以用注解
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate = stringRedisTemplate;
    }
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)){
            //不存在,不拦截直接结束
            return true;
        }
        //2.基于token获取redis中的用户
        String key = RedisConstants.LOGIN_USER_KEY+token;
        Map<Object,Object> userMap = stringRedisTemplate.opsForHash()
                .entries(key);
        //3.判断用户是否存在
        if(userMap.isEmpty()){
            //4.不拦截，直接放行
//            response.setStatus(401);
            return true;
        }
        //5.将查询到的Hash数据转化为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap,new UserDTO(),false);
        //6.存在,保存用户到ThreadLocal
        UserHolder.saveUser(userDTO);
        //7.刷新token有效期
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request,HttpServletResponse response,Object handler,Exception ex){
        //移除用户
        UserHolder.removeUser();
    }
}